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High-strength steel plate and manufacturing method thereof

A high-strength steel plate, technology of manufacturing methods, applied in the direction of manufacturing tools, furnace types, furnaces, etc., capable of solving problems such as failure to reach yield strength

Active Publication Date: 2012-07-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] None of the above high-strength steel plates meet the requirements of yield strength greater than or equal to 1300MPa and tensile strength greater than or equal to 1400MPa

Method used

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  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Smelt in electric furnace or converter according to the chemical composition shown in Table 1, and cast into continuous casting slab or steel ingot, heat the continuous casting slab or steel ingot to 1080°C, start rolling at 1030°C, pass deformation rate 5-30%, The final rolling temperature is 940°C, and the thickness of the finished steel plate is 8mm. Cool in air after rolling. The quenching heating temperature is 850°C. The tempering temperature is 300°C.

Embodiment 2

[0039] The implementation is the same as in Example 1, wherein the heating temperature is 1100°C, the rolling start temperature is 1050°C, the pass deformation rate is 5-30%, the final rolling temperature is 950°C, and the thickness of the finished steel plate is 10mm. Cool in air after rolling. The quenching heating temperature is 870°C. The tempering temperature is 280°C.

Embodiment 3

[0041] The implementation is the same as in Example 1, wherein the heating temperature is 1190°C, the rolling start temperature is 1140°C, the pass deformation rate is 5-30%, the final rolling temperature is 1000°C, and the thickness of the finished steel plate is 12mm. Cool in air after rolling. The quenching heating temperature is 900°C. The tempering temperature is 260°C.

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Abstract

The invention relates to a high-strength steel plate which comprises the following chemical compositions according to percentages by weight: 0.26-0.35% of C, 0.15-0.50% of Si, 0.60-0.90% of Mn, 0.60-1.00% of Cr, 0.55-0.90% of Mo, 0.80-2.00% of Ni, 0.01-0.10% of Nb, 0-0.10% of V, 0.0006-0.0025% of B, 0.01-0.08% of Al, 0.003-0.06% fo Ti, the rest of Fe and inevitable impurities. A manufacturing method of the high-strength steel plate comprises the following steps of: smelting, casting, heating and rolling the steel plate, and then carrying out austenitization quenching thermal treatment on the steel plate in the temperature of 850-950 DEG C, and adopting water quenching treatment after austenitization; and finally carrying out tempering thermal treatment in the temperature of 180-300 DEG C and air cooling after tempering. The organization of the obtained steel plate is tempered martensite; the yield strength of the steel plate is greater than or equal to 1300Mpa; the tensile strength of the steel plate is greater than or equal to 1400Mpa; and the charpy impact energy, i.e. Akv (-20 DEG C) of the steel plate is greater than or equal to 30J.

Description

technical field [0001] The invention relates to a high-strength steel plate and a manufacturing method thereof, in particular to a high-strength steel plate with good low-temperature toughness and a yield strength of 1300 MPa and a manufacturing method thereof. Background technique [0002] High-strength steel plates are widely used in the manufacture of engineering machinery structural parts, such as large-scale engineering cranes and large-tonnage floating cranes for ships. The increasing size of construction machinery puts forward the demand for enhanced weight reduction of steel plates. Generally, the yield strength of high-strength steel plates is 960MPa and below, such as the European standard EN10025-6: 2004 (Hot rolled products of structural steels-Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition ) and the national standard 16270-2009 (quenched and tempered steel plate for high-st...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D1/18C21D9/00
Inventor 赵四新姜洪生姚连登柏明卓
Owner BAOSHAN IRON & STEEL CO LTD